Actually, it might be more. Art teacher Gonja Wolf told a student she could pee in a bucket if she had to go that bad. I suspect she was tired of the "endless stream" of requests, and used some sarcasm, not expecting it to be taken seriously. Now the student's parents want a $25 K settlement with the district.
People who haven't taught don't necessarily understand how disruptive and detrimental little things like bathroom breaks can be. Remember the teacher that took away points when kids said "bless you?" He had many adults riled up over the small courtesy of saying "bless you." But in a classroom context it becomes a game which I witnessed myself. You might get 5 sneezes and "bless you's" in a minute's time. The same goes for bathroom breaks. They become an excuse to get out of class, and disrupt whatever momentum the teacher has. I often had 8 requests for the bathroom in a period. I probably had about that many academic questions in a year. I must have been a "bad" teacher like Ms. Wolf. Note the anger in the commentary on huffington post. There's a real wave of bitterness in the population towards teachers, in general.